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. Given the need for accurate knowledge of aerosolmicrophysical and optical properties with height resolution, variousalgorithms combining vertically resolved and column-integrated aerosolinformation have been developed in the last years. Here we present newresults of vertically resolved extensive aerosol optical properties(backscattering, scattering and extinction) and volume concentrationsretrieved with the GRASP (Generalized Retrieval of Aerosol and SurfaceProperties) algorithm over a 3-year period. The range-corrected signal (RCS)at 1064 nm measured with a ceilometer and the aerosol optical depth (AOD)and sky radiances from a sun/sky photometer have been used as input for thisalgorithm. We perform a detailed evaluation of GRASP retrievals withsimultaneous in situ measurements performed at the same height, at theMontsec mountaintop observatory (MSA) in the Pre-Pyrenees (northeasternSpain). This is the first long-term evaluation of various outputs of thisalgorithm; previous evaluations focused only on the study of aerosol volumeconcentration for short-term periods. In general, our results show goodagreement between techniques although GRASP inversions yield higher valuesthan those measured in situ. The statistical analysis of the extinctioncoefficient vertical profiles shows a clear seasonality as well assignificant differences depending on the air mass origin. The observedseasonal cycle is mainly modulated by a higher development of theatmospheric boundary layer (ABL) during warm months, which favors thetransport of pollutants to MSA, and higher influence of regional andNorth African episodes. On the other hand, in winter, MSA is frequentlyinfluenced by free-troposphere conditions and venting periods and thereforelower extinction coefficients that markedly decrease with height. This studyshows the potentiality of implementing GRASP in ceilometer and lidarnetworks for obtaining aerosol optical properties and volume concentrationsat multiple sites, which will definitely contribute to enhancing therepresentativeness of the aerosol vertical distribution as well as to providinguseful information for satellite and global model evaluation.

atmospheric measurement techniques

Retrieval of aerosol properties from ceilometer and photometer measurements: long-term evaluation with in situ data and statistical analysis at Montsec (southern Pyrenees)